Researchers have integrated a tiny light emitting diode (LED) display into a contact lens. The display projects images and text into the eye from a mobile device. The electricity to do this is provided wirelessly from a looped antenna embedded in the transparent lens. The eye-LEDS will display a lot more information that the conventional smart phone screen. “This will enable us to generate large images that will appear to float in front of the eye at a distance of 20 to 40 inches,” say Babak Parviz , a nanotechnology specialist at the University of Washington in Seattle.

However, it will be several years before you see this technology launched on the market. In the meantime we can look forward to an intelligent projection, a system in which LEDs are used to project the image of a keyboard onto a surface such as a desk and a display image on the screen above it. This “home computer for the future” will use an infrared sensor to detect even the slightest finger movements.

A finger or stylus disturbs the units electromagnetic field, which extends across the touchscreen like an invisible film of moisture. The smartphone analyzes the disturbance and interprets them as movements.

The human body is a good conductor of electricity. When you place your finger into electric field, current flows through your body and down into the earth. The closer your finger is to the electrode , the stronger the current from that electrode will be-which is how the smartphone always knows where your finger is.

The smartphone interprets each movement your finger makes with the help of data it collects and stores( e.g point of origin , directional movement, speed and endpoint).